Skip to main content

languageOptions

See the source

Configures the ECMAScript version and module source type for your project.

Defaults​

OptionDefault
ecmaVersion"latest"
sourceType"module"

Options​

uglify({
  with: ["languageOptions"],
  options: {
    languageOptions: {
      ecmaVersion: 2022,
      sourceType: "module",
      additionalGlobals: {
        myGlobal: "readonly",
      },
    },
  },
})

ecmaVersion​

The ECMAScript version to parse. Default: "latest".

sourceType​

Either "module" (ESM) or "commonjs". Default: "module".

additionalGlobals​

An object of additional global variables to define. Keys are variable names, values are "readonly" or "writable".

note

You typically don't need this block explicitly — the environment configs (node, web, etc.) set language options automatically. Use this when you need fine-grained control over the ECMAScript version or source type.